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Sep 17, 2021 at 13:40 comment added R.W. Bird As Bill N points out, the choice is arbitrary.
Sep 16, 2021 at 20:03 comment added Bill N One could just as easily assert that due to the rigid structure of the object, the object exerts a displacing, mechanical force on the fluid, and the fluid exerts a reaction force on the object,
Sep 16, 2021 at 19:15 history answered R.W. Bird CC BY-SA 4.0